The Stokes parameters are (up to sign) the coefficients of
the characteristic polynomial of a certain “\((n+1)\) -th root of monodromy” matrix
\( M^{(0)} \) , from which the Stokes matrices can be read off.
The definition of
\( M^{(0)} \) , and the proof of the theorem, is given in section 6 of [1]}.
It
should be noted that the Stokes parameters are canonical, unlike the Stokes matrices themselves,
which depend on various choices. This is important for physical applications.
